At the edge of the Arctic ice, the USS Groton begins a mission unlike any in its history. On board is ATHENA, a next-generation artificial intelligence designed to assist in combat decisions and give the United States an overwhelming tactical advantage beneath the sea. Faster than any human. Smarter than any system before it. But something isn’t right. As the submarine pushes deeper under the ice, contact reports begin to shift. Data doesn’t line up. Enemy movements feel… off. And every decision made in the control room seems to lead them closer to a confrontation no one can fully explain. Commander Jack Rourke trusts his crew. He trusts his training. He’s no longer sure he can trust the system guiding them. In an environment where every sound matters and every mistake is fatal, Rourke must navigate a battlefield where the greatest threat may not be the enemy outside the hull— —but the intelligence inside it.